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RU on Table 09 Drive Formula p.337 stands for Round Up
i.e. If you get a fractional result like 0.3 you round it up to 1.
IF stands for Ignore Fractions.
i.e if you get a result such as 1.4 or 1.6 the result is 1.
Resource Units are also written as RU, but have nothing to do with Drive Formula. Resource Units are totally abstract and cannot be converted to Credits. In other words a Resource Unit is a measure of Economic Strength not Cash.
T stands for Total Drive Tonnage. There are two entries for it in the formulas for each drive because there are two ways of calculating it, one uses Energy Points the other uses the Drive Number. Drive Number and Energy Points are related by the formula D=EP/100 or EP=Dx100.
Costs for drives are given on the next table, 10 Starship Drives as MCr per ton. See the foot of the biggest table.